diff --git a/action.yml b/action.yml
index 16f9ef4..2a75838 100644
--- a/action.yml
+++ b/action.yml
@@ -9,7 +9,7 @@ inputs:
     description: 'Access token for clone repository'
   clean:
     description: 'If true, execute `execute git clean -ffdx && git reset --hard HEAD` before fetching'
-    default: true
+    default: 'true'
   submodules:
     description: 'Whether to include submodules: false to exclude submodules, true to include only one level of submodules, or recursive to recursively clone submodules; defaults to false'
   lfs: